Man, that is so weird. It sounds so uneducated to my ear to say "He had got sick" or "He has got over it." He had gotten sick. He has gotten over it. The only time I can think of off the top of my head where "has got" would be allowed would be when you're saying the phrase "has got" to mean "must", e.g. "He has got to stop doing that!" I guess there's another one, the case where you're filling the void that results from contracting "has" or "have", as in the sentence "He's got two kids" (instead of simply "He has two kids" or "He's two kids"). And that one would never have worked with "gotten" anyway, it's a totally different grammar role as far as I can tell. But yeah, other than those few cases... the past participle of "get" is totally "gotten." Man. So weird that in the UK it's shifted away. Now I'm curious to know how recently this happened.

"He has wrote a new book." (Should be written. Write, wrote, written.)

In the same sense that all of the previous examples should sound weird to your ear, "has got" as in the specific sentence "He has got better" sounds super weird and ungrammatical.

A sister example that I've found brought up a lot while lightly researching this is "forgotten", as apparently some English speakers might say it's forget / forgot / forgot while in America it is undoubtedly forget / forgot / forgotten, e.g. "I've forgotten your name" and never "I've forgot your name." The latter, while understandable, sounds super low-class.

African elephants and Asian elephants are not closely related, relatively speaking: they are in different genus and have over 6 million years of genetic separation. In fact, the woolly mammoth is more closesly related to the Asian elephant than the African elephant is. The degree of difference is so great, it's comparable to that of humans versus chimpanzees.

Yet, an african-asian elephant hybrid did live at one point. More a footnote proof-of-concept in evolutionary history, it nonetheless shows that cladograms are still nothing but simplifications and that they can't tell the whole story when it comes to genetic compatibility.

Back on the mammoth: while it's not possible to bring them back to life, mammoth-specific genes taken from carcasses have been inserted into Asian elephant cells, and are expressing proteins for cold adaptation. It's very possible, within the next two decades, we could see a mammoth-like elephant adapted for cold roaming the steppe of Pleistocene Park.